Leaderstats change connection, Gui pop-up?

How could i make it so if a player got a kill or even two it notifies them?

**This is not a request site, so I will give you a way to set this up. ** You can make the GUI say what you want it to say, and look how you want it to look, and set it's Visibility to true. Then, whenever someone gets a kill, make the GUIs Visibility false for a few seconds, and then make it true again.